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So, what do you think about this one, if i want to make a MMX2/3 with a MMX3 PCB.

First thing first: That's fine for putting MMX3 on an MMX3 board.

However. In the data programmed to the ROM is a command that controls whether the game addresses one ROM or two ROMs. So I think you'll have difficulty if you program MMX2 in and just place that on an MMX3 board.

Quote:

I got 2 x 27C801, how can i do so to make a MM2 with a MMX2 PCB ?

Just connect them, like-named pin to like-named pin. This case should be straightforward.

MMX2 is 1.5MiB, so split it into the first 1 MiB and last 512 KiB; the first 1 MiB go onto the "U1" footprint and the last 512 KiB go onto the "U2" footprint.

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